<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style>
        div{
            width: 100px;
            height: 100px;
            background-color: green;
            border-radius: 0px 100px 100px 0px;
        }
    </style>
</head>
<body>
<div></div>

</body>
</html>